TruCluster Default Alias...

Hello.I am a little confused. I have always been under the impression that when a telnet/ftp/ssh session is originated from a version 5.1B TruCluster member the originating address will be the default alias' one. I have a three node TruCluster, and am issuing an sftp {or to test a telnet session} to a remote server, over a WAN via a Cisco FireWall PIX. What I can see on the PIX, is that the originating address is from the specific cluster member. Yet to prove that I am not going mad a connection to any host on the LAN, and I get the source address as the default alias. Do any of you guys know if this means I have my routing tables mis-configured?? Can any of you give me a clue as to where I can start looking?? Thanks, in advance for your help.Cheers!!!Keith